I think any color is suitable. It sounds like your colors are very formal to begin with, so I think it would definitely be acceptable. Are you leaning toward silver or black? Because with either one, I don’t think anyone would question it. My font color is a charcoal grey, nobody will probably notice except me, but it’s just a touch off of black and I love it. Just be careful if you’re having silver, that’s it not too light and difficult to read.

I would order some samples from your vendor – that way you can see what the ink looks like on the paper. We went with cranberry and plum inks, on antique white paper, and they look great. There’s no reason you can’t use both silver and black. A lot of websites have examples of multiple color printing, and using two ink colors can be really nice looking. For instance, you could use black for the actual lettering, and have silver graphics and/or a silver monogram watermark. That way you avoid any difficulties with reading the silver, but still incorporate it in the whole design.